1620556160 has 128 divisors (see below), whose sum is σ = 4004683200. Its totient is φ = 626688000.

The previous prime is 1620556129. The next prime is 1620556181. The reversal of 1620556160 is 616550261.

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3962036 + ... + 3962444.

Almost surely, 2^1620556160 is an apocalyptic number.

1620556160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620556160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2002341600).

1620556160 is an abundant number, since it is smaller than the sum of its proper divisors (2384127040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620556160 is a wasteful number, since it uses less digits than its factorization.

1620556160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620 (or 608 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1620556160 is about 40256.1319552686. The cubic root of 1620556160 is about 1174.5946777626.

The spelling of 1620556160 in words is "one billion, six hundred twenty million, five hundred fifty-six thousand, one hundred sixty".